AT1320M Gamma Activity Monitor

AT1320M Gamma activity monitor is a fixed scintillation radiometric unit, designed to measure volume gamma-radiation activity of 51Cr, 99mTc, 111In, 123I, 125I, 131I and 201Tl radionuclides in liquid radioactive waste.  Measurement geometry - Marinelli beaker, 1.0 litre

Operating principle
AT1320M Gamma activity monitor operating principle is based on sample radionuclide gamma radiation detection by scintillation detector, instrument spectrum measuring and further matrix method processing with measuring of monitored radionuclide volume activity.
Radionuclide activity data is displayed on Information processing unit screen in real-time.
Setting up procedure and parameter check is performed with 133Ba check sample.

  • Nuclear medicine
  • Radiopharmacy 
  • Radioecology
  • Radioactive waste control 
  • Spectrometric smart probe with built-in continuous automatic LED stabilisation of energy scale and parametric temperature stabilization
  • Memory function and automatic background subtraction for volumetric activity measurement
  • Recording and storing in memory up to 300 measured spectra
  • PC with dedicated software can be used instead of data processing unit to provide documentation function and for expanding of monitored radionuclides library
AT1320M Gamma Activity Monitor meets
Safety standard requirements: IEC 61010-1:1990
EMC requirements: EN 55022:1998+A1:2000+A2:2003, EN 55024:1998+A1:2001+A2:2003,
IEC 61000-4-2:2001, IEC 61000-4-3:2008, IEC 61000-4-4:2004, IEC 61000-4-5:2005,
IEC 61000-4-11:2004, IEC 61000-3-2:2005, IEC 61000-3-3:2002


Display instrument spectrum
Display radionuclide volumetric activity
Detector Scintillation, NaI(Tl)-Ø63x63 mm
Volume activity measuring range  
     125I 5 – 2·106 Bq/l
     201Tl, 99mTc, 123I, 111In, 131I 3 – 2·105 Bq/l
     51Cr            20 – 2·106 Bq/l
Basic fractional error of radionuclide volume ±30 % max.
activity measurement  
Measured samples density 1 g/cm3
Energy range of measured gamma radiation 20 keV- 500 keV
Number of ADC channels 512
Operation mode setup time 10 min
Continuous work time ≥24 h
Measurement instability during continuous service ≤3%
Working temperature range 0oC to 40oC
Relative humidity with air temperature up to 75%
≤30oC without condensation  
External background radiation level 0.2 µSv/h max.
Power supply 230 V(+23 V/-35 V), 50±2 Hz
Power input 8 VA max.
Protection class IP40
Measurement beakers Marinelli beaker, 1.0 l
PC connection USB 2.0
Overall dimensions  
     Processing unit 106x220x35 mm
     Detecting unit Ø98x350 mm
     Protection unit Ø600x700 mm
     Processing unit 0.5 kg
     Detection unit 2.0 kg
     Protection unit 125 kg


Download brochure786.63 KB